My Problem is that when the engine is started, the sonar sideimage and downimage pictures falls apart! (There are many disturbing wave is on the screen. I tried to move the sonar head to forward, but did not improve the pictures. )
It can not be used for sideimagine or other viewing mode.

What solution is there to this Problem?

Is there a usable Sonar Head, which would be wired to the electromagnetic disturbance is protected?
As anyone who wishes to be a wire? Aluminium tape?

I'm Follow the steps provided below to confirm and reduce this interference:
1. motors may produce interference all speeds, i'm so tested at as many speeds as possible.
2. I have 2 Battery pack: 1. Main - Battery Pack 48 V, 100 Ah LithyumFePolymer ( 4 piece 12V 100Ah in series line) 2. Sonar and lighting Battery Pack: 12V , 45 Ah classic Battery. It is not connection in the two DC circuit. ! (separated)
3. NoiseFilter (ON) HELIX 5SI: no make better Image wenn the motor is on.
4. I tried the sonar head in several Places on the Boat . But the Pictures is wrong.
5. I have not other sonar, and not networking, etc.
6. I do not hear the noise in my radio ... ??? !
7. The Interference is bigger in the 200 Hz and the 488Hz. ???? !